Introduction: Periodontal disease (PD) is an inflammatory disease of the periodontal tissues. Periodontal disease is highly prevalent in adolescents, adults, and elderly, and is a major public health concern [ 1 Nazir M. Prevelence of periodontal disease, its association with systemic diseases and prevention. Int J Health Sc. 2017;2(1):72–80. [Google Scholar] , 2 Machado V , Botelho J , Amaral A , et al., Prevalence of periodontal disease in a Portuguese population. Annals of Medicine. 2017;50(sup1):S73. [Google Scholar] ]. Previous studies show a slight superior prevalence of mild forms in young adults [ 3 Botelho J , Machado V , Amaral A , et al. Association between age and chronic periodontitis in a Portuguese population. Annals of Medicine. 2018;50(Suppl 1):S70–S71. [Google Scholar] ], and a significant difference in periodontal disease type distribution by gender, with severe generalized chronic periodontitis condition being more prevalent in men [ 4 Botelho J , Machado V , Amaral A , et al. Association between overweight/obesity and chronic periodontitis in a Portuguese population. Annals of Medicine. 2018;50(Suppl 1):S69–S70. [Google Scholar] , 5 Machado V , Botelho J , Amaral A , et al. Association between gender and chronic periodontitis in a Portuguese population. Annals of Medicine. 2018;50(Suppl 1):S71–S72. [Google Scholar] ]. Moderate periodontitis is even more common, affecting 40–60% of adults [ 6 Leech M , Bartold P . The association between rheumatoid arthritis and periodontitis. Best Pract Res Clin Rheumatol. 2015;29(2):189–201. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar] , 7 Sen S , Sumner R , Hardin J , et al. Periodontal Disease and Recurrent Vascular Events in Stroke/TIA Patients. J Stroke Cerebrovasc Dis. 2017;22(8):1420–1427. doi:10.1016/j.jstrokecerebrovasdis.2013.06.024 [Crossref] , [Google Scholar] ]. Over the last years, PD have been associated with arterial hypertension [ 6–8 Leech M , Bartold P . The association between rheumatoid arthritis and periodontitis. Best Pract Res Clin Rheumatol. 2015;29(2):189–201. Sen S , Sumner R , Hardin J , et al. Periodontal Disease and Recurrent Vascular Events in Stroke/TIA Patients. J Stroke Cerebrovasc Dis. 2017;22(8):1420–1427. doi:10.1016/j.jstrokecerebrovasdis.2013.06.024 Leong X , Ng C , Badiah B , et al. Association between Hypertension and Periodontitis: Possible Mechanisms. Sc Wold J 2014;768237:11. doi:10.1155/2014/768237 ]. Therefore, the aim of this study was to evaluate the possible association between the prevalence of self-reported hypertension and the periodontal status in an adult Portuguese population. Materials and methods: This study was approved by the Egas Moniz Ethical Committee (Ethical Application Ref: 595). This retrospective observational study included patients from the Periodontology Department, that were diagnosed between April 2017 and April 2018. Before clinical examinations, all patients answered a general and oral health questionnaire that included information such as age, gender, smoking status, self-reported general medical history and medication. Periodontitis was defined according to Page & Eke [ 9 Page RC , Eke PI. Case definitions for use in population-based surveillance of periodontitis. Journal of Periodontology. 2007;78:1387–1399. doi:10.1902/jop.2007.060264 [Crossref], [PubMed], [Web of Science ®] , [Google Scholar] ]. From a total of 267 patients, 7 were excluded due to incomplete data. Thus, it was gathered a final sample size of 260 patients. Descriptive and inferential statistics methodologies were applied, using IBM SPSS Statistics version 24.0 for Macintosh. Results: From the 260 patients (mean age 56.6 ± 12.4), the majority had severe chronic periodontitis (n =140, 53.8%). Patients with none or mild chronic periodontitis didn’t refer hypertension. The prevalence of self-reported hypertension was 38.61% and 36.43%, in patients with moderate and severe chronic periodontitis respectively. Overall, there was a statistical difference between the prevalence of self-reported hypertension between the severity of chronic periodontitis type (p = 0.004) (Table 1). Discussion and conclusions: The results show a statistical difference in the prevalence of self-reported hypertension according to the chronic periodontitis severity. To minimize potential bias, we tried to overcome the limitation of being a self-reported hypertension information by confirming current medication of the patient. The findings in this sample are according to the previous studies referred overhead.